Transmitting of vocal and other sounds.



P. P. HERRGUTH. TRANSMITTING OP VOCAL AND OTHER SOUNDS. APPLIOATIOH FILED F3319, 1910v RENEWED MAR.28,1911.I

1,086,535@, Patented Feb. 10, 1914.

FRANK. I". 1 SAN FRANCISCG; GALIFORNIA, ASSIGNOB, E UNIVERSAL VTIRELESS TELM QJIQNE FORTE L41,

AH'D TELEGRAPE CQMPANY, A CORPORATION 03 CALL THANS'HTTTIZNG G VOCAL AND OTHER F-I DS.

mplication February 19, 1316, Eerie 110. 14.,

use of wires to guide the waves to their des tination and has for its object to provide a new and improved system for the above purpose by means of which electromagnetic waves by the voice, telegraph key or other sounds are transmitted through the air from a transmitter to a receiver which receives the sonorons vibrationssent from the transmitter, said transmitter controlling a rapid intermittent train of the electro-magnetic waves.

Referring to the accompanying drawings, the figure is a diagram of a transmitting system in accordance with this invention in which the amplitude of a rapid intermittent trainof electric oscillations may be controlled.

Referring to the figure, the electric current is supplied by means of an electric gen orator 1, which. current may be either a quickly interrupted direct current, or an alternating current. A id heatstone bridge 2 is located in the same circuit with the generates 1 and in said circuit between the generator 1, and the il heatstone bridge are located two variable resist-a1 cos 3, Current is suppliedfby the generator 1 through the resistances ii, to the our arms of he Wheatstone bridge conn sing four induction coils t, 5, 6, 7. Shumed across these induction coils at suitable points four carbon inicrophones, or other teieph one transmitters 8.

Tn "etc of brid 'c arms 1, 3, ans. 5, 7 are el a iy ed by conductors 9, which in n are connected by electrical conductors with an adiustablc primary winding 11, and to a k ml bre telegraph key l econd i t 13 the trans- V, is minncctevv with two carbon 1 ones, or other telephone transmitters an electric circuit and also two spark in in said circuit, The spark 15 are shunted by variable condensers Specification of Letters Eatent.

Patented Feb. 10, 191 1.

Renewed March 28, 1911. Serial No. 617,496.

16, telephone transmitters 17, and adjustable induction coils 18 in said electric circuit, The induction coils 18 form primary windings for an air core transformer having secondary coils 15)::vhich are in series and are connected with a carbon or other telephone trai'ismitter 2 and with the aerial conductor 21 and earth conductor 22.

The bridge arms are not balanced for either direct or alternating current, but arms 1 and if" may be of a low resistance and 5 and 6 may be of a high resistance orvice versa so that the microphone transmitters 8 shunt.- ed across the bridge arms will vary the cur: rent in primary coil 11 of the transformer. The induced current generated in the secondary coil of the transformer is varied by the microphone transmitters 1 1 in series with the. spark gaps 15, and the intermittent current discharge across the spark gaps 15 is varied by condensers 16, induction coils 18 and by micro-phone transmitters 17. The induction coils 19 are influenced by an induced current from the induction coils 18 and are connected with the earth and the aerial transmitting conductor 21.

Any two or all of these transmitters may be used simultaneously which will cause a material variation in the electrical waves emitted by the aerial conductor.

One or both-of the spark gaps may vbe used and a close or loose coupling employed for the aerial ctmductor or the earth conductor.

The telegraph key 12 is used for signaling purposes only and when in use the microphone transmitters are either cut out of cirunit or shunted by a suitable switch.

Referring to the figure, bridge arms 1 and Y may be made low, and arms 5, and 6 may be made high or vice versa, so that the microphone transmitters 8 shunted across the bridge arms will vary the current in primary coil 11 of the transformer. The induced current generated in the secondary coil of the transformer is varied by the microphone transmitters 14 in series with the spark gaps 15, and the intermittent current discnarge across the spark gaps 15 is varied by condensers 16, induction coils 18 and by microphone transmitters 17. The induction coils 19 are influenced by an induced current from the induction coils 18 and are connected with the earth and the aerial transmitting conductor 21. Any two or all of these transmitters may ire-used "which will cause a ineterial variation in the electrical waves emitted by the aerial conductor This device will operate when all of these transmitters are connected in circuit.

One or both of the spark gaps maybe used and a close or loose coupling employed for tlieiaerialconductor, or the earth conductor.

Having described the invention, I claim: 1. In asystem. for the transmission and reception of-vocal or other sounds including articulate speech Without the use of guiding Wires, a transmitting system comprising a transmitting conductor, a Wheatstone bridge located in said conductor having a number of inductance coils, microgihones shunted across said coils, and a step-up transformer having an adjustable primary Winding connected with the inductance coils of the reception of vocal and other sounds including articulate speech Without the use of guiding wires, 1 transmitting system com- Z/rising a transmitting conductor, a Wheatstone bridge located in said conductor having a number of inductance coils, microphones shunted across said coils, and a step up transformer having its primary winding connected with the inductance coils of the Wheatstone bridge) In testimony whereof. l1 afiix my signature in presen e of two witnesses.

FRANK P HERRGUTH.

. nesse.;:

H. G. SoHRoEoEB,

F. P. Scnsononn. 

